[56] Micheli 1729.

[57] Dillenius 1719.

[58] See Druce and Vines 1907.

[59] Crombie 1880.

[60] Haller 1742.

[61] Linnaeus 1753.

[62] Schneider 1897.

[63] Hill 1751. Hill’s genus Collema is Nostoc, etc.

[64] Hill 1760.

[65] Watson 1759.